Typewriting machine



Jan. 8, 1935. Q w, RUMRlNE 1,987,283

TYPEWRITING MACHINE Filed May 25. 1951 INVENTOR CHESTER W. CRUMRINE ATTORNEY Patented Jan. 8, 1935 UNITED STATES PATENT OFFICE TYPEWRITING MACHINE Chester W. Crumrine, Rochester, N. Y., assignor to Electromatic Typewriters, Inc.,' Rochester, N. Y., a corporation of New York Application May 23, 1931, Serial No. 539,561

1 Claim.

Another object of the invention is the provision of a power driven roller for actuating star wheels operatively connected with the printing instrumentalities, the engagement of said star wheels with said roller being selectively controlled by means of a perforated master sheet.

To these and other ends, the invention consists in the construction and arrangement of parts that will appear from the following description when read in conjunction with the accompanying drawing, the novel-features being pointed out in the claim at the end of the specification.

The drawing represents a vertical transverse section of so much of a typewriting machine as is necessary to illustrate one possible embodiment of the invention.

This machine comprises a platen 1 with which a pivoted type bar 2 is adapted to cooperate to print on a work sheet arranged thereon. Although only one type bar and actuating means associated therewith is illustrated herein for the sake of ,clearnes s... it will beunderstood that the usual number of type bars may be employed. Power operated means comprising a power driven roller 3 are provided for actuating the type bars into engagement with the platen.

The power driven roller 3 has its surface provided with alternate depressions and projections for engagement with the arms 4 of a star wheel 5 revolubly mounted on one arm of a bell crank lever 6 pivoted on a fixed part and having its other arm operatively connected with one end of a toggle lever 7 by means of a link 8. The lever 7 is pivotally connected with the type bar at 9,

and at its other end is pivotedto a toggle arm 10 pivoted on a fixed part. When the lever 6 is actuated, it swings the lever 7 to break the toggle and swing the type bar into engagement with the platen. A spring 11 connects the lever 6 with a fixed part and tends to swing the lever'to resiliently press the star wheel into engagement with the power driven roller or a perforated mastersheet 12 arrangedthereon. Normally two arms of the star wheel engage the master sheet on which they ride idly" until one of them meets a perforation in the sheet when it projects therethrough into engagement with one of the depressions in the roller, which turns the star wheel on its axis and cams it away from the power roller to swing the lever 6 and actuate the type bar to print.

Although only one embodiment of the invention is illustrated herein, it will be understood that this application is intended to cover such changes or modifications as come within the spirit of the invention or scope of the following claim.

I claim:

In an automatic typewriting machine having no in "card, the combination with a platen, of a pivoted type bar movable into engagement therewith, a toggle lever pivotally connected to the type bar beneath the pivotal point of the type bar, said toggle lever having a downward extension, a bell crank lever including a pair of arms extending rearwardly from the pivotal point of the bell crank lever at substantially right angles to each-other, one of said arms extending laterally and the other upwardly, a link directly connecting the end of said upwardly extending arm of the bell crank with the downward extension of the toggle lever whereby rocking of the bell crank lever effects an endwise movement of said link, a star wheel mounted on the laterally extending arm of the bell crank lever, a type bar operating power driven roller having depressions cooperating with said star wheel, and a perforated master sheet on the roller controlling engagement of the star wheel with the type bar operating power driven roller.

CHESTER W. CRUMRINE. 

